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rb_io_buffer_t: pack structure

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* include/ruby/io.h (rb_io_buffer_t): pack structure
  Reduces rb_io_t from 200 to 192 bytes, allowing rb_io_t to
  occupy one less cache line.
  [Feature #10050]

n.b. this leaves a 4-byte hole after the `cbuf' field which may
be used for future expansion.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46884 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2014-07-20 04:19:06 +00:00
parent 910d081d02
commit eeb05e8c11
2 changed files with 9 additions and 2 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
Sun Jul 20 12:44:23 2014 Eric Wong <e@80x24.org>
* include/ruby/io.h (rb_io_buffer_t): pack structure
Reduces rb_io_t from 200 to 192 bytes, allowing rb_io_t to
occupy one less cache line.
[Feature #10050]
Sun Jul 20 12:41:53 2014 Eric Wong <e@80x24.org>
* include/ruby/io.h (rb_io_t): shrink to 200 bytes from 216 on 64-bit

4
include/ruby/io.h
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@ -51,12 +51,12 @@ extern "C" {
RUBY_SYMBOL_EXPORT_BEGIN
typedef struct {
typedef PACKED_STRUCT(struct {
char *ptr; /* off + len <= capa */
int off;
int len;
int capa;
} rb_io_buffer_t;
}) rb_io_buffer_t;
typedef struct rb_io_t {
FILE *stdio_file; /* stdio ptr for read/write if available */